Nodulizing ores, &amp;c.



PATENTED JUNE 12, 1906.

No. 822,929v

C. DELLWIK. NODULIZING GRES, 6:0.

fr {15A/tl v APPLIUATION FILED MAE. 22, 1906.

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UNITED STATES PATENT OFFICE;

)ARL DELLWIK, OF LONDON, ENGLAND, ASSIGNOR TO J. EDUARD GOLDSOHMID, OF FRANKFORT-Oll-THE-MAIN, GERMANY.

NODULIZING DRES. scf

No. ssaeso.

I Specification of Letters Patent.

Patented June 12, 1906.

Application illsd lim-cli Q2. 1965. Serial No! 307,387.

don, England, have invented certain new and useful Improvements in Nodulizing Gres and the Like; and I do hereby declare the following to be a full, clear and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and usek the same.

My invention relates to certain newr and useful im rovements in the nodulizing of ores, metalliferous'residues, and the like.

According to the prevailing practice the ores, flue-dust, blue billy, or the like are charged into the up er end of an inclined rotating kiln travers b products of combustion and issues at the ower end of said kiln in the form of nodules or small lumps of irrlar rounded contour sufficiently hard and s ciently orous to be char ed to advantage in the blast-furnace. In t ose instances Where the products of combustion for heating the interior of the kiln are derived from a grate lire or from the combustion of ulverized fuel or of blast-furnace `gas or lemons gas or other like fuel of low calorilic ower the rota kiln employed is usually o very considera le length in order finally to bring the particles to the high temperature required for the' formation of the nodulized product. In these long kilns thus heated the slagging or scoriiication of the particles begine at a very considerable distance from the oWer or discharge end, and it is found that highly-refractory rings or bands of scorie form upon the interior lining of the kiln remote from the discharge end. T ese rings or bands interfere with the proper functioning of the kiln and are difficult of access and i of removal.

My present invention involves a Vnodulining operation which has for its purpose the production of a short sharp flame of great caloriic power and of comparativel small volume located at a point in relative y close proximity to the lower or discharge end of 4the rotary kiln, such flame being reduced by the combustion of Water-gas an the ein p oyment of a suplplementar flame of lar er volume and of a c eaper com ustible-as, or instance, blast-furnace gas, producer-gas, or pulverized fuel-dor the purpose of supplying thernain body of heat used in the upper portions of the rotary kiln. By this expedient I localiae the sintering or ritting stage of the noduliaing operation to a zone of the kiln in near vicinity to its discharge end, so that it may roceed under'conditions eculiarly a propriete to the ellects desired, and at t e same time I supply the great body of heat for the preliminary stage of the operationas, for instance, driving oil moisture from the ore,desulfurizing, or otherwise urifying itby the combustion of a relativel) cheap combustible in the upper portions ofy the furnace, Where it is of less im ortanoe that the coinbustible employed s ould be of the same qualit as the sintering-flame.

In t e accompanying drawing I have illustrated in longitudinal section a form of rotary kiln appropriate to the practice of my invention.

Referring to the drawing, A indicates the body portion of the kiln, sup orted in an inclinedposition in any siita le manner, as shown, and adapted to be rotated at a suitable speed of revolution by appropriate gearing. (Not shown.)

represents the feed-hopper for the admission of the ore, flue-dust, or the like to be nodulised, and C represents any suitable exitfiue for the esca e of the Waste gases.

a indicates a ischarge-port for the admission of a body of Water-gas, and t represents a port for the admission of air in proximity to the water-gas discharge, so that the resultant Water-gas llame may, as indicated, be projected against the bottom of the' kiln at a point in nearproximity to the outlet end thereof.

c indicates a port for the admission of the cheaper combustible-as, for instance blast furnace gas, Siemens gas, pulverized fuel, or the like-and d represents the correspondin air-admission port for' the combustion of said cheaper fuel, the resultant flame taking its course upiivardly through the kiln in such manner as to heat its contents mainly by radiation. The air is sup lied either under pressure or by induced cliaft, and by the manipulation of a propriate valves'I am enabled to regulate t e flame from each of these sources to produce the effects desired quite independently of the surroundin atmosphere in the kiln. The flame om the cheaper' fuel passes above the intense lower flame, filling the kiln and the products o combustion of both flames eventually mix and pass through the kiln, adually heating the material moving in t e opposite an downward direction.

I do not restrict myself to introducin the flame of cheaper fue at the extreme oWer end of the kiln. It may to advantage be introduced higher up in the kiln, or, ifpreferred, the a paratus may consist of two kilns, in one owhich the prelimina heating by the chea er gas takes place, the ower one being heate by the nodulizing flame of Water-gas. It is also obvious that instead of a revolving kiln an inclined kiln rocking upon its longitudinal axis may be employed, and in this case also the flame of lower grade may be introduced at any desired distance from the lower end.

eaaeiae *A Having thus described my invtio, what I claim irs- The method of heating kilns for the nodulizing of ores, metalliferous residues, and the like, which consists in limitin the nodulizing or sinterizin izone to a relatively short distance from t e discharge end by the employment of a flame of intense caloric ower at said discharge end, and supplying t e additional heat necessary for the preliminary stages of the operation b a flame of lowergrade fuel and of relative?r inferior temperature of combustion; sugstantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CARL DELLWIK.

Witnesses:

H. C. TUxBimY, WILLIAM H. DAvIs. 

